Bit of trivia, what 3 main cast members from last season where in movie together and what was the name of the film?

Jeffrey DeMunn, Laurie Holden and Melissa McBride were in The Mist.

I saw that on Sci-Fi (or a part of it) last night...and it was made by Frank Darabount, so no wonder they got picked up for Walking dead. Had Frank stayed on, i wonder if we would have seen more cast members?